Dinosaurs · Sauropod
Opisthocoelicaudia
Say it o-pis-tho-seel-i-cawd-ee-a. The name means ‘hollow-backed tail [vertebrae]’.
- Length
- 12 m
- Diet
- Plant-eater
- When
- Late Cretaceous72 to 68 million years ago
- Fossils found in
- Mongolia
- Named by
- Borsuk-Bialynicka (1977)
- Family tree
- Dinosauria › Saurischia › Sauropodomorpha › Sauropoda › Macronaria › Titanosauriformes › Titanosauria › Lithostrotia › Saltasauridae
Sauropods. Long-necked, four-legged plant-eaters, the biggest animals ever to walk on land. See all 59
Lived at the same time
- Anserimimus · same country
- Borogovia · same country
- Heyuannia · same country
- Homalocephale · same country
- Microceratus · same country
- Mononykus · same country
- Nemegtosaurus · same country
- Nomingia · same country
Other sauropods
- Nemegtosaurus Late Cretaceous
- Ampelosaurus Late Cretaceous
- Isisaurus Late Cretaceous
- Magyarosaurus Late Cretaceous
- Neuquensaurus Late Cretaceous
- Alamosaurus Late Cretaceous
- Saltasaurus Late Cretaceous
- Dreadnoughtus Late Cretaceous
Source: Opisthocoelicaudia in the Natural History Museum Dino Directory, read 12 November 2026. Sizes are the museum's estimates for a typical adult. "Lived at the same time" lists dinosaurs whose dates overlap, which does not always mean they met.